ASTM A335 Alloy Boiler Pipe Chemical Composition

ASTM A335 seamless ferritic alloy-steel pipe are intended for high-temperature service. ASTM A335 pipe ordered to this specification shall be suitable for fusion welding, bending, flanging (vanstoning), and similar forming operations.
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ASTM A335 alloy boiler pipe may be either hot finished or cold drawn with the finishing heat treatment

ASTM A335 Alloy Boiler Pipe Chemical Composition Requirements: 

		Grade	P-5	P-9	P-11	P-22	P-91	P-91 shall also include the following:
Element		UNS Designation	K41545	S50400	K11597	K21590	K91560
Carbon		0.15 max	0.15 max	0.05 – 0.15	0.05 – 0.15	0.08 – 0.12	V at 0.18 – 0.25
Manganese		0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	0.30 – 0.60	N at 0.030 – 0.070
Phosphorous, max		0.025	0.025	0.025	0.025	0.020	Ni at 0.40 max
Sulfur, max		0.025	0.025	0.025	0.025	0.010	Al at 0.02 max
Silicon		0.50 max	0.25 – 1.00	0.50 – 1.00	0.50 max	0.20 -0.50	Cb at 0.06 – 0.10
Chromium		4.00 – 6.00	8.00 – 10.00	1.00 – 1.50	1.90 – 2.60	8.00 – 9.50	Ti at 0.01 max
Molybdenum		0.45 -0.65	0.90 – 1.10	0.44 – 0.65	0.87 – 1.13	0.85 – 1.05	Zr at 0.01 max

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Tensile Requirements

		Seamless
		P-5	P-9	P-11	P-22	P-91	P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].
Tensile Strength, min., psi
	ksi	60	60	60	60	85
	MPa	415	415	415	415	585
Yield Strength, min., psi
	ksi	30	30	30	30	60
	MPa	205	205	205	205	415